I o Contents 



XIII. SPIRE-SHELLS AND MARSH-SNAILS 



PAGE 



Round -mouthed Snail— A sea-snail that has left the sea 

 — Evidences of its origin — Its shell door — Its enemy, Drilus 

 • — Point-shell — Spire-shells — Rissoas and Hydrol)ias — Small 

 and numerous — Fresh-water Winkles — Sentinel-shells— 

 Belted shell — Marsh Snails or River Snails— Viviparous — 

 Valve-shells ....... 228 



XIV. COWRY AND PYRAMID-SHELLS 



Small Needle-Avhelk — " Shillihllies " — Horn-shells — The 

 Reversed Horn — Obelisk-shell — Screw-shell or Auger— A 

 snail that deliberately breaks its shell — Strange history of 

 the Blind-shell — Pelican's-foot — Cowries — Another object- 

 lesson in s'.. ell-evolution — Margin - shell — Poached Egg — 

 Protective ornamentation — European Cowry — Atlanta . 238 



XV. WHELKS AND CONELETS 



Some toothless sea-snails — Polished Eulima — Of para- 

 sitic descent — LTrchin Snail — A strange habitat — Pyramid- 

 shells by the score — The teeth of the Whelk family — 

 Spindle-shells — Why a siphon is needed — Sting-winkles — 

 Varices or growth lines : what they indicate — AVhy oysters 

 are scarce — The Purjjle and its dye — How it clings to wave- 

 washed rocks — Its stony shell — How the Star-fish eats it 

 out of house and home — Its singular egg-capsules — Dog- 

 whelks — Desjwilers of bait — Spindle- shells — Red Whelk or 

 Buckie — White Whelk — Common Whelk — Varieties and 

 monsters — Egg capsules — Keen scent— Money value of a 

 Whelk " fishery "—Least Wlielk—Conelets . . . 248 



XVI. SEA-SLUGS 



Darwin's mistake about Sea-slugs — How shells have 

 been discarded — Actreon and Bubble-shells — Snail crushers 

 — Canoe - shells — Blind burrowers — Shells hidden and 

 thinned — Lobe - shell — Sea Hare — A reputed depilatory- 

 Its colour changes — Its purple clouds — The true Sea-slugs 

 ^Pleurobranchus — How enemies are discouraged — The 

 origin of foot-lobes — Crowned Runcina — Cerata and tlieir 

 functions — Sea Lemons— Resemblance to sponges— Sense- 



